Re: [PATCH 7/9] mm: delete NR_PAGES_SCANNED and pgdat_reclaimable()

[Hillf Danton]

On March 01, 2017 5:40 AM Johannes Weiner wrote: 
> 
> NR_PAGES_SCANNED counts number of pages scanned since the last page
> free event in the allocator. This was used primarily to measure the
> reclaimability of zones and nodes, and determine when reclaim should
> give up on them. In that role, it has been replaced in the preceeding
> patches by a different mechanism.
> 
> Being implemented as an efficient vmstat counter, it was automatically
> exported to userspace as well. It's however unlikely that anyone
> outside the kernel is using this counter in any meaningful way.
> 
> Remove the counter and the unused pgdat_reclaimable().
> 
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> ---
Acked-by: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>